Here's an interesting take on what's going on from NY magazine's Jonathan Chait:
The Republican primary battle has come to resemble the love triangle in the movie Casino. The GOP electorate is Sharon Stone, torn between wealthy, calculating casino boss Robert DeNiro, whom she recognizes it is in her interest to marry, and James Woods, the sleazy pimp ex-boyfriend she can't quite leave behind. She keeps rebuffing his marriage proposals, insisting she's not in love with him, but he's undeterred. "I'm realistic. I can accept that," he says. "But, you know, what is... What is love anyway? It's a -- it's a mutual respect."